<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>警示框--默认警示框</title>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
</head>
<body>
<div class="alert alert-success" role="alert">恭喜您操作成功！</div>
<div class="alert alert-info" role="alert">请输入正确的密码</div>
<div class="alert alert-warning" role="alert">您已操作失败两次，还有最后一次机会</div>
<div class="alert alert-danger" role="alert">对不起，您输入的密码有误</div> 
<br/><br/>
<!--下面是任务部分-->


<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script> 
</body>
</html>